Abstract: Systems, methods, apparatuses, and computer program products for interference reduction. One method may include calculating at least one downlink beamforming coefficients vector, and estimating at least one channel coefficient. Interference may be calculated, and a configuration may be selected based upon a determination of interference power. The transformed beamforming coefficients vector may be calculated by at least one of minimizing maximum interference power over one or more uplink antenna elements, minimizing mean interference power over one or more uplink antenna elements, or minimizing interference power based on uplink beamforming.

Abstract: Apparatus and methods for transmitting a preamble in a random access procedure are described herein. A user terminal may transmit two or more preambles to access a base station, for example, on a selected random access channel (RACH) in a contention-based random access procedure. The user terminal receives a random access response (RAR) from the base station, for example, on PDCCH, wherein the RAR is a response of the preambles transmitted by the transmitter. More than one preamble is transmitted by the user terminal in a contention-based random access procedure. In this way, the user terminal has a lower probability of transmitting the same preambles that other user terminals have transmitted. This helps the user terminal efficiently avoid a collision with other user terminals in the random access procedure. The user terminal therefore has a higher probability of a successful access.

Abstract: Apparatus and methods for transmitting a preamble in a random access procedure are described herein. A user terminal may transmit two or more preambles to access a base station, for example, on a selected random access channel (RACH) in a contention-based random access procedure. The user terminal receives a random access response (RAR) from the base station, for example, on PDCCH, wherein the RAR is a response of the preambles transmitted by the transmitter. More than one preamble is transmitted by the user terminal in a contention-based random access procedure. In this way, the user terminal has a lower probability of transmitting the same preambles that other user terminals have transmitted. This helps the user terminal efficiently avoid a collision with other user terminals in the random access procedure. The user terminal therefore has a higher probability of a successful access.

Abstract: In a non-limiting and example embodiment, a method is provided for controlling usage of prioritized radio channels, comprising: detecting (310), by a secondary user apparatus, an interference limitation of a first radio channel for which a primary user apparatus has priority over the secondary user apparatus, selecting (320), by the secondary user apparatus, the first radio channel for communication with another apparatus to a first direction after detecting the interference limitation, and selecting (330), by the secondary user apparatus, a second radio channel for communication with the other apparatus to a second direction, opposite to the first direction.

Abstract: An integrated circuit (IC) includes a first I/O cell, a logic cell, a trigger signal generation circuit, and a second I/O cell having a voltage selection pin. I/O interfaces of the first I/O cell receive first and second supply voltages, respectively, and I/O interfaces of the second I/O cell receive third and fourth supply voltages, respectively. The first I/O cell generates a first trigger signal when the first supply voltage reaches a first predetermined voltage. The logic cell receives the first trigger signal and generates a safe-state signal. The trigger signal generation circuit generates a second trigger signal when the third supply voltage reaches a second predetermined voltage. The voltage selection pin receives the safe-state signal and the second trigger signal and sets the second I/O cell in a safe-state mode, which protects the second I/O cell from over voltage damage.

Abstract: An integrated circuit (IC) includes a first I/O cell, a logic cell, a trigger signal generation circuit, and a second I/O cell having a voltage selection pin. I/O interfaces of the first I/O cell receive first and second supply voltages, respectively, and I/O interfaces of the second I/O cell receive third and fourth supply voltages, respectively. The first I/O cell generates a first trigger signal when the first supply voltage reaches a first predetermined voltage. The logic cell receives the first trigger signal and generates a safe-state signal. The trigger signal generation circuit generates a second trigger signal when the third supply voltage reaches a second predetermined voltage. The voltage selection pin receives the safe-state signal and the second trigger signal and sets the second I/O cell in a safe-state mode, which protects the second I/O cell from over voltage damage.

Abstract: According to an example embodiment, a method may include allocating, within a single physical resource unit (PRU), a plurality of channel sounding groups. Wherein each channel sounding group includes a frequency-time domain code division multiplexing (CDM) allocation. The method may also include broadcasting, in a downlink direction to one or more mobile stations in a wireless network, a signal that causes the receiving mobile stations to transmit a channel sounding signal. The method may further include receiving at least one channel sounding signal from at least one of the one or more mobile stations, the channel sounding signal being received in an uplink direction via one or more channel sounding groups. And, the method may include estimating the channel quality, of the channel used by the physical resource unit, based upon the received at least one channel sounding signal.

Abstract: In a non-limiting and example embodiment, a method is provided for controlling usage of prioritized radio channels, comprising: detecting (310), by a secondary user apparatus, an interference limitation of a first radio channel for which a primary user apparatus has priority over the secondary user apparatus, selecting (320), by the secondary user apparatus, the first radio channel for communication with another apparatus to a first direction after detecting the interference limitation, and selecting (330), by the secondary user apparatus, a second radio channel for communication with the other apparatus to a second direction, opposite to the first direction.

Abstract: According to an example embodiment, a method may include allocating, within a single physical resource unit (PRU), a plurality of channel sounding groups. Wherein each channel sounding group includes a frequency-time domain code division multiplexing (CDM) allocation. The method may also include broadcasting, in a downlink direction to one or more mobile stations in a wireless network, a signal that causes the receiving mobile stations to transmit a channel sounding signal. The method may further include receiving at least one channel sounding signal from at least one of the one or more mobile stations, the channel sounding signal being received in an uplink direction via one or more channel sounding groups. And, the method may include estimating the channel quality, of the channel used by the physical resource unit, based upon the received at least one channel sounding signal.

Abstract: In a receiver first stage, received signals are equalized using first stage channel estimates, a first data stream is separated from a second data stream; and interference on the first data stream is re-generated by filtering the decoded first data stream (after decoding) using the first stage channel estimates. Second stage channel estimates are calculated using the first stage channel estimates and gain derived from generating the interference, and the interference is subtracted from the received signals. In the receiver second stage, the signals from which the interference was subtracted are equalized using the second stage channel estimates, the second stream of data is decoded; and the decoded first data stream and the decoded second data stream are output. One embodiment gets channel estimates for each stage from the received signal and regenerates pilot interference; the other calculates updated channel estimates from the first stage for use in the second stage.

Abstract: In accordance with an example embodiment of the present invention, a method is disclosed that comprises receiving a resource reservation request for a sounding channel, the resource reservation request comprising a first transmission direction and a first set of logical resources; mapping the first set of logical resources to a first set of physical resources, at least in part based on the first transmission direction; and mapping the first set of physical resources to a second set of logical resources at least in part based on a second transmission direction.

Abstract: Method and apparatus for soft bit computation with a reduced state equalizer. The method assures that the number of states in the equalizer is reduced to obtain acceptable complexity, while also ensuring that soft bit computation is performed for substantially all bits. The method involves computing a first set of soft bits from bits transmitted in a received signal, using a reduced-state trellis with finite non-zero delay, calculating hard decisions in response to the received signal, and also ensuring that substantially all soft bits are computed by employing zero-delay soft decision-making or decision-feedback equalization to compute a second set of soft bits. Furthermore, the hard decisions are used to compute the second set.

Abstract: Method and apparatus for soft bit computation with a reduced state equalizer. The method assures that the number of states in the equalizer is reduced to obtain acceptable complexity, while also ensuring that soft bit computation is performed for substantially all bits. The method involves computing a first set of soft bits from bits transmitted in a received signal, using a reduced-state trellis with finite non-zero delay, calculating hard decisions in response to the received signal, and also ensuring that substantially all soft bits are computed by employing zero-delay soft decision-making or decision-feedback equalization to compute a second set of soft bits. Furthermore, the hard decisions are used to compute the second set.

Abstract: A method and apparatus for performing video compression and decompression using dynamic quantization and/or encoding. According to one aspect of the compression method, an image is recursively filtered into its constituent components each represented by a matrix of coefficients. Next, the level of correlation of a first of the matrices of coefficients is determined. Based on the level of correlation of this first coefficient matrix, one of a first quantization technique and a second quantization technique is selected. The first coefficient matrix is then quantized using the selected quantization technique. According to another aspect of the compression method, an image is digitally filtered into its constituent components, each represented by a matrix of coefficients. At least certain matrices are quantized to generated a first quantized matrix.